A Broadband Spectrum Channelizer with PWM-LO Based Sub-Band Equalization

Ki Yong Kim, Heechai Kang, V. Singh, R. Gharpurey
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引用次数: 1

Abstract

A spectrum channelizer that employs a frequency-folded analog-to-digital converter (FF-ADC) is described. The design allows for downconversion and channelization of a broadband spectrum into contiguous sub-bands, by using polyphase downconversion, baseband analog-to-digital conversion, and sub-band separation through digital-domain harmonic rejection. The sub-bands are aliased at baseband in the polyphase paths. At baseband, the sub-bands with large signal power can reduce the effective ADC dynamic range available for those with lower power levels. An approach that employs pulse-width-modulated local oscillator (PWM-LO) waveforms in the polyphase paths, for equalizing the sub-bands at baseband, prior to digitization, is proposed to address this issue. The approach makes it possible to vary the spectral response of the FF-ADC with low signal-path complexity.
基于PWM-LO子带均衡的宽带频谱信道器
描述了一种采用折频模数转换器(FF-ADC)的频谱信道转换器。该设计允许宽带频谱的下变频和信道化,通过使用多相下变频、基带模数转换和通过数字域谐波抑制的子带分离。子带在多相路径的基带处混叠。在基带,信号功率较大的子带会降低功率较低的ADC的有效动态范围。为了解决这一问题,提出了一种在多相路径中使用脉宽调制本振(PWM-LO)波形在数字化之前均衡基带子带的方法。该方法可以在低信号路径复杂度的情况下改变FF-ADC的频谱响应。
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